feat: stream return.

middleware/gzip.go

@@ -55,3 +55,10 @@ func (w *gzipResponseWriter) Write(data []byte) (int, error) {
 func (w *gzipResponseWriter) WriteString(s string) (int, error) {
 	return w.gzWriter.Write([]byte(s))
 }
+
+func (w *gzipResponseWriter) Flush() {
+	w.gzWriter.Flush()
+	if flusher, ok := w.ResponseWriter.(http.Flusher); ok {
+		flusher.Flush()
+	}
+}